He said information was still being collated, but his personal observation was it was too big a project.
"It is unlikely to be practicable or affordable. In a perfect world where money was no object then it is a very elegant solution because it cuts out Devil's Elbow and windy roads around Lake Tutira.
"The incline is pretty standard and the line is pretty straight but the problem is the rail corridor - probably less than 4m wide in key points - is carved into the side of very steep hills. So to go from 4m to 30m-to-40m would literally involve moving mountains. However, it is going to be looked at."
Another improvement under consideration for State Highway 2 was traversing the Waikare Gorge at Putorino in a similar way to how Matahorua Gorge was traversed in 2011.
He said the rail line through to Wairoa, on which Napier Port is planning to run a service hauling logs, was in very good condition.
"All that basically needs to happen is to hook up some signals again, to clear some vegetation - which is not a big job - and replace some sleepers on the line that have rotted away."
It was hoped the log service would start in October "but it might slip past that".
"It's a long game."